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get_phys_pages(3) [linux man page]

GET_PHYS_PAGES(3)					     Linux Programmer's Manual						 GET_PHYS_PAGES(3)

NAME
get_phys_pages, get_avphys_pages - get total and available physical page counts SYNOPSIS
#include <sys/sysinfo.h> long int get_phys_pages(void); long int get_avphys_pages(void); DESCRIPTION
The function get_phys_pages() returns the total number of physical pages of memory available on the system. The function get_avphys_pages() returns the number of currently available physical pages of memory on the system. RETURN VALUE
On success, these functions return a nonnegative value as given in DESCRIPTION. On failure, they return -1 and set errno to indicate the cause of the error. ERRORS
ENOSYS The system could not provide the required information (possibly because the /proc filesystem was not mounted). CONFORMING TO
These functions are GNU extensions. NOTES
These functions obtain the required information by scanning the MemTotal and MemFree fields of /proc/meminfo. The following sysconf(3) calls provide a portable means of obtaining the same information as the functions described on this page. total_pages = sysconf(_SC_PHYS_PAGES); /* total pages */ avl_pages = sysconf(_SC_AVPHYS_PAGES); /* available pages */ EXAMPLE
The following example shows how get_phys_pages() and get_avphys_pages() can be used. #include <stdio.h> #include <stdlib.h> #include <sys/sysinfo.h> int main(int argc, char *argv[]) { printf("This system has %ld pages of physical memory and " "%ld pages of physical memory available. ", get_phys_pages(), get_avphys_pages()); exit(EXIT_SUCCESS); } SEE ALSO
sysconf(3) GNU
2019-03-06 GET_PHYS_PAGES(3)

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GET_PHYS_PAGES(3)                                            Linux Programmer's Manual                                           GET_PHYS_PAGES(3)

NAME
get_phys_pages, get_avphys_pages - get total and available physical page counts SYNOPSIS
#include <sys/sysinfo.h> long int get_phys_pages(void); long int get_avphys_pages(void); DESCRIPTION
The function get_phys_pages() returns the total number of physical pages of memory available on the system. The function get_avphys_pages() returns the number of currently available physical pages of memory on the system. RETURN VALUE
On success, these functions return a nonnegative value as given in DESCRIPTION. On failure, they return -1 and set errno to indicate the cause of the error. ERRORS
ENOSYS The system could not provide the required information (possibly because the /proc filesystem was not mounted). CONFORMING TO
These functions are GNU extensions. NOTES
These functions obtain the required information by scanning the MemTotal and MemFree fields of /proc/meminfo. The following sysconf(3) calls provide a portable means of obtaining the same information as the functions described on this page. total_pages = sysconf(_SC_PHYS_PAGES); /* total pages */ avl_pages = sysconf(_SC_AVPHYS_PAGES); /* available pages */ EXAMPLE
The following example shows how get_phys_pages() and get_avphys_pages() can be used. #include <stdio.h> #include <stdlib.h> #include <sys/sysinfo.h> int main(int argc, char *argv[]) { printf("This system has %ld pages of physical memory and " "%ld pages of physical memory available. ", get_phys_pages(), get_avphys_pages()); exit(EXIT_SUCCESS); } SEE ALSO
sysconf(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU 2017-09-15 GET_PHYS_PAGES(3)
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